class Animal:
    name='animal'
    def shout(self):
        print('animal shout')
animal  = Animal()
print(animal.name)
animal.shout()

class Dog(Animal):
    name='dog'
    def __init__(self):
        self.age=1
    def eat(self):
        print('dog eat')
dog1 = Dog()
print(dog1.name)
dog1.name='wangwang'
print(dog1.name)
print(Dog.name)
Dog.name='wangwang111111'
print(Dog.name)
dog2 = Dog()
print(dog2.name)
print(dog2.age)